You can Update Garmin nuvi using Wi-Fi by following these steps:

1. Connect the device to a Wi-Fi network (Wi-Fi Network Connection).
2. Select Updates from the drop-down menu under Settings.
3. Update Available shows below Map or Software when an update is available.
4. Select Install All.
5. Accept the term and conditions.
6. Connect the device to external power using the provided USB cord, then select Continue.
7. Keep the device powered up and within range of the Wi-Fi network until the update is finished.